heat exchangers, not being parts of machines; heating and cooling systems comprised of heating units and cooling units for residential and commercial buildings; wastewater treatment apparatus for use in connection with recovering energy from wastewater for the purpose of heating and cooling residential and commercial developments; purification installations for sewage; parts and fittings for refrigeration, air-conditioning and heating systems, namely, pipes, filters, vents, tubes, boilers, manifolds, thermostats and wires

'air':57 'air-condit':56 'apparatus':26 'boiler':67 'build':23 'commerci':22,45 'compris':12 'condit':58 'connect':30 'cool':10,17,42 'develop':46 'energi':33 'exchang':2 'filter':64 'fit':53 'heat':1,8,14,40,60 'instal':48 'machin':7 'manifold':68 'name':62 'part':5,51 'pipe':63 'purif':47 'purpos':38 'recov':32 'refriger':55 'residenti':20,43 'sewag':50 'system':11,61 'thermostat':69 'treatment':25 'tube':66 'unit':15,18 'use':28 'vent':65 'wastewat':24,35 'wire':71

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